U.S. patent application number 10/919602 was filed with the patent office on 2005-06-30 for circuit interrupter with reset lockout and reverse wiring protection.
Invention is credited to Gao, Shaohua.
Application Number | 20050140476 10/919602 |
Document ID | / |
Family ID | 34338796 |
Filed Date | 2005-06-30 |
United States Patent
Application |
20050140476 |
Kind Code |
A1 |
Gao, Shaohua |
June 30, 2005 |
Circuit interrupter with reset lockout and reverse wiring
protection
Abstract
A ground fault circuit interrupter (GFCI) with a reset lockout
mechanism and reverse wiring protection is applicable to various
appliance, instruments, equipments, devices or systems. Its
characteristics are that: a lockout mechanism or a reverse wiring
protection part is mounted at the reset button, the conducting
static contacts of the load side are fixed to the wiring pieces of
the load side, and the conducting movable contacts of the line side
are in direct touch with the wiring pieces of the load side. As
compared with the prior art, the circuit interrupter of this
invention has features as follows: smaller volume, less winding
turns, more intensive magnetic force of the trip coil, faster
tripping speed, more effective and more reliable protection
function of the reset button, less sparks produced while the trip
is being reset, more steady and better conductivity when supplying
power, and simpler structure which makes its assembly work easier,
thus productivity can be enhanced and the cost reduced.
Inventors: |
Gao, Shaohua; (Yue Qing,
CN) |
Correspondence
Address: |
Thomas R. FitzGerald, Esq.
Suite 210
16 E. Main Street
Rochester
NY
14614-1803
US
|
Family ID: |
34338796 |
Appl. No.: |
10/919602 |
Filed: |
August 17, 2004 |
Current U.S.
Class: |
335/18 |
Current CPC
Class: |
H01R 2103/00 20130101;
H01R 24/76 20130101; H01H 83/04 20130101; H01R 13/7135
20130101 |
Class at
Publication: |
335/018 |
International
Class: |
H01H 073/00 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 26, 2003 |
CN |
200310122859.1 |
Claims
1. A GFCI with a reset lockout device and a reverse wiring
protection device having a test button and a reset button. Wherein
the line side includes the line side conducting movable contacts,
and the load side includes the load side connection pieces. The
characteristics are a lockout mechanism or a reverse wiring
protection part being mounted on the reset button, the conducting
static contacts being fixed on the wiring pieces of the load side,
and the conducting movable contacts of the line side mentioned
above being in direct contact with the conducting static contacts
of the load side.
2. The GFCI mentioned in claim 1 possesses a reset lockout
mechanism and a reverse wiring protection part with the following
characteristics: The said lockout mechanism connected to the reset
button (010) includes a reset core rod (025) having a flat head on
the lower end below the reset button (010). A reset spring (027)
rests and is fitted on the upper end of the reset core rod (025).
Below the reset core rod (025) is a reset trip latch (030). Below
the reset trip device (022), and inside the trip coil bracket
(019), there is a reset lockout movable contact (031) and a mating
reset lockout static contact (032). A spring supporter (009) is
located below the reset button (010), under the two ends of the
spring supporter (009) are the assistant springs (028-1,028-2)
respectively. Two trip assistant springs are respectively pressed
on the two line side conducting movable contacts (012-1,012-2)
which are placed on the reset trip device (022).
3. The GFCI mentioned in claim 1 possesses the following
characteristics: The reverse wiring protection device connected to
the reset button (010) includes a reset core rod (025) having a
sharp head on the lower end. A reset spring (027) fits on the upper
end of the reset core rod (025). And a reset trip latch (030) is at
the sharp end of the reset core rod (025). Two reverse trip
conducting springs (033-1,033-2) are put beside the two sides of
the trip coil racket (019). One end of the two reverse trip
conducting springs (033-1,033-2) is fixed to the circuit board
(013), and above the other end is the reset trip device (022). The
lower ends of two reverse trip guarding contacts (061-1, 016-2)
placed beside both sides of the trip coil racket (019) are fastened
to the circuit board (013), the upper ends threaded through the two
sides of the tripping device and are fastened on the reverse trip
conducting springs (033-1,033-2). Under the reset button (010),
there is one compression spring bracket (009). Under the
compression spring bracket (009), there are two trip assisting
springs (028-1, 028-2). The two trip assisting springs (028-1,
028-2) are located on the two line side contacting movable points
(021-1, 021-2) of reset trip device (022).
4. The said GFCI mentioned in claim 1 has the following
characteristics: 2 The relay trip coil (020) of trip coil bracket
(019) is wrapped with a U-shaped magnet (038), which is fastened at
both ends to the trip coil bracket (019). A round magnetic cover
(040) is placed between the trip core (021) inside trip coil
bracket (019) and the reset trip latch (030). The magnetic cover
(040) is connected with the U-shaped magnet (038) and placed
between the trip core (021) and the magnetic cover (040) is the
trip core spring (039).
Description
FIELD OF THE INVENTION
[0001] The present invention relates to a kind of GFCI, especially
to GFCI with a reset lockout and reverse wiring protection
mechanism. It is widely used in various appliances, devices,
instruments, equipments and systems.
ART BACKGROUND
[0002] Most electric wire connection devices, which are used for
appliances, devices, instruments, and systems, have a line side
which is connectable to an electrical power supply, and a load side
which is connectable to one or more load ends. There is at least a
sensing circuit between the line side and the load side. In the
event the load side is improperly connected to the power source, or
when ground fault occurs, this will not only result in device
damage but also fire or serious personal shock hazard will occur.
So it is very important to mechanically break the electrical
connection between the line side and the load side promptly when
the instance occurs.
[0003] In the Prior Art:
[0004] (1) U.S. Pat. No. 4,595,894 has described a "ground fault
circuit interrupter system--GFCIS", this system uses an
electrically activated trip mechanism to mechanically break an
electrical connection between the line side and the load side. When
the fault occurs, the device cannot reset even operate the reset
button for more than 10 times and it will stay in the tripped
condition. However, instances may arise where an abnormal
condition, caused by, for example, a surge current, may result in
disabling of a trip mechanism. The device can be pressed down,
i.e., may be reset without the ground fault protection
available.
[0005] (2) This invention relates to a commonly owned CN patent
NO.031163157 (published NO.CN1441449A) which describes a ground
fault circuit interrupter with a reverse wiring protection
mechanism connected to a reset button on the load side. The reset
button will stay in the tripped condition while the power source is
miswired to the load side, or when ground fault occurs. It cannot
be reset even when the reset button is operated for more than 100
times until the miswiring is corrected. Comparing with the prior
art (1), it provides a more reliable reset button, a simpler
structure and lower cost, which is suitable for producing in batch.
But there is still room for improvement, for example, the reset
button may be designed in such a way it can never be pressed down
while the power source is miswired to the load side, and when
ground fault occurs, thus the protection may be more effective. Its
structure may be further simplified to improve productivity and
lower its cost.
SUMMARY OF THE INVENTION
[0006] In order to overcome the shortcomings of the prior art, the
present invention provides a GFCI with reset lockout and reverse
wiring protection mechanism. While the power source is miswired to
the load side, or when ground fault occurs, the reset button cannot
be pressed down all the time, and keeps the GFCI in the tripped
condition. The structure is further simplified and productivity is
enhanced.
[0007] The present invention adopts an art as follows: The circuit
interrupter includes a reset button and a test button. A lockout
mechanism or a reverse wiring protection mechanism is mounted onto
the reset button. Two static contacts of the load side are fixed to
the two wiring pieces of the load side respectively, and two
conducting movable contacts of the line side make direct touch with
the conducting static contacts of the load side. These further
improve the trip mechanism and increase magnetic force.
[0008] If the AC power is miswired to the load side, there will be
no current in the receptacle face all the time, as the load side is
interrupted by the separation of socket static contact conducting
pieces. When the GFCI is in tripped condition, its reset trip
lockout cannot be pressed down all the time, because its trip
lockout rod is in locked condition, which prevent the reset button
from being reset, avoid usage in reverse wiring condition, and so
provides safety.
[0009] As said before, if the AC power is miswired to the load
side, even operate the reset button which is in the tripped
condition to reset the device, it will trip again, thus prevent the
power being supplied to the receptacle face. Even some one operates
the reset button continuously, the device will not reset, thus
avoid the damage to the electrical appliance and hurt to the user
caused by reverse wiring and prolong the life of the device as
well. When the AC power is properly wired to the line terminals,
pressing down the reset button and current will flow through the
receptacle static contact conducting pieces and out to the load
side, where the user accessible load side connection may includes
one or more connection points, thus ensures the breaker will work
normally. At this time, the reset lockout mechanism will not affect
the GFCI being reset or making false trip.
[0010] The advantages of the present invention are apparent. With
lockout mechanism mounted onto the reset button, the lockout
mechanism will "lock" the reset button, which makes it impossible
to pressed down while the device is miswired or when ground fault
occurs. The device will remain in the tripped condition until the
faults is corrected. With reverse trip protection device mounted
onto the reset button, while the device is miswired or when ground
fault occurs, every time the reset button is pressed down, it will
spring up immediately and stay in the tripped condition forever
even it is operated for more than 100 times or up to thousands of
times until the faults is corrected. Therefore, the reset button of
the device of the present invention is more reliable, and while the
trip is being reset, less spark will be produced.
[0011] Moreover, according to the present invention the two
conducting movable contacts of the line side make contact with the
conducting static contacts on the two load side wiring pieces
directly. Comparing with the prior art (2), the two reverse movable
contacts are now removed, making the structure simpler, assembling
work easier and enhancing productivity and further lowering cost.
Furthermore, the conducting movable contacts of the line side touch
the conducting static contacts of the load side directly, which
makes the electric conduction more stable and more effective. Thus
the GFCI of the present invention not only can effectively prevent
device damage and personal hazard but also can become capable of
standing the 6KV/3KA electrical surge test and have a good ability
of anti-corrosion and anti-moisture.
[0012] The present invention improved the trip mechanism, decreased
the number of wire turns in the trip coil and increased magnetic
force. All these make structure further simpler, assembling work
further easier, action more stable and protection more
dependable.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] FIG. 1 is the inner structural schematic of GFCI of the
present invention.
[0014] FIG. 2-1 is a structural schematic diagram, illustrating the
reset button with a reset lockout device of the circuit interrupter
of the present invention.
[0015] FIG. 2-2 is a structural schematic diagram, illustrating the
reset button with a reverse wiring protection device of the circuit
interrupter.
[0016] FIG. 3 is the back view of the circuit board 013 for the
structure of FIG. 2-1.
[0017] FIG. 4 is a schematic diagram of the reset button with the
lockout device in FIG. 2-1, under a tripped position.
[0018] FIG. 5 is a schematic diagram, illustrating the reset button
with the lockout device in FIG. 2-1, when reverse wiring exists and
it cannot be reset.
[0019] FIG. 6 is the transverse section view of FIG. 5.
[0020] FIG. 7 is a schematic diagram, illustrating the connection
between the line side and the load side, and the reset button with
a lockout mechanism in a reset condition.
[0021] FIG. 8 is a schematic diagram, further illustrating the
connection between the conducting movable contacts of line side and
the conducting static contacts of the load side.
[0022] FIG. 9 is a more detailed configuration sketch of a lockout
device in the reset button.
[0023] FIG. 10 is a more detailed configuration sketch of a reset
button with a lockout device and conducting pieces of the load
side.
[0024] FIG. 11 is a view of a reset button with a reverse trip
protection device in the tripped position.
[0025] FIG. 12 is a view of the reset button with a reverse trip
protection device, when the GFCI is in reverse wiring condition,
the reset button cannot be reset.
[0026] FIG. 13 is a schematic diagram, illustrating the reset
button in the structure of FIG. 2-2 in reset position, when the
GFCI is in reverse wiring condition.
[0027] FIG. 14 is a schematic diagram, illustrating the reset
button in the structure of FIG. 2-2 in the reset position, the line
side and the load side are connected.
[0028] FIG. 15 is a more detailed view of the reset button with
reverse trip protection device.
[0029] FIG. 16 is a more detailed view of the conducting pieces of
the load side.
DETAILED DESCRIPTION OF EMBODIMENTS
[0030] Referring to FIG. 1, it shows the internal structure of the
circuit interrupter according to present invention. The GFCI
consists of a base 023, the circuit board 013 being placed in the
said base 023, a test button 008 and a reset button 010 being
located on the circuit board 013. Beneath the reset button 010
there is a spring support 009. There are a toroidal magnetic core
sleeve 002 and a magnetic cover 003 placed inside. There are two
line sides include wiring screws 006-1, 006-2, wiring pieces 004-1,
004-2, pressure pieces 005-1, 005-2 and the two line side
conducting pieces 007-1, 007-2 which are connected to the toroidal
magnetic core at one end. There are two line side conductors 011-1,
011-2 on the two line side conducting pieces 007-1, 007-2. The two
line side conductors 011-1, 011-2 are connected to two line side
conducting movable contacts 012-1, 012-2. There are two load sides
include wiring screws 017-1,017-2 and conducting pieces 018-1,18-2.
On conducting pieces 018-1,18-2, there are two conducting static
contacts 015-1, 015-2 on which there is a silver contact 014. A
trip coil bracket 019 is placed between the two conducting pieces
018-1, 018-2 of the load side. On the trip coil bracket 019, there
are a U-shaped magnet 038 and a trip coil 020 (for detail please
refer to FIG. 9). On both sides of the trip coil 020, there are two
reverse trip movable contacts 016-1, 016-2. There is the reset trip
device 022 beneath the reset button 010. Four assembly screws 001
are mounted on each corner respectively.
[0031] As of the above mentioned structure, when the power source
is connected to the line side via the two wiring screws
006-1,006-2, pressing down the reset button 010 which is in the
tripped position, will in turn depress the reset trip device 022,
thus the reset trip latch 030 is forced to lock the reset core rod
025, and the reset trip device 022 rises back to its original
position because of the bias force of the reset spring 027, the
reset button 010 is forced back to its original extended position
and the circuit interrupter receptacle will have power through. If
ground fault occurs, when overload or current leakage is larger
than 5 mA during the operation, the current surge wave induction
will activate the trip coil 020, which in turn causes the reset
trip device 022 to activate, and the device is tripped. So it will
cut the power and make the circuit interrupter receptacle having no
power and ensure safety.
[0032] As seen in FIG. 1, in the said GFCI of the present
invention, two conducting static contacts 015-1, 015-2 with the
silver points 14 are connected to the wiring pieces 018-1,019-2
respectively. When power is applied to the GFCI, the two line side
conducting movable contacts 012-1,012-2 touch the load side
conducting static contacts 015-1,015-2 directly, thus the electric
conducting path is stable and effective.
[0033] Now let's turn to FIG. 2-1, which shows the structure of the
reset button 10 with the lockout mechanism in the present
invention. As seen in FIG. 2-1, the lockout mechanism comprises the
reset core rod 025 which has a flat head below the reset button
010, and a reset spring 027 which fits to the upper end of the
reset core rod 025. Below the reset button 010 is the reset trip
device 022. Below the reset core rod 025 is the reset trip latch
030. In the trip coil bracket 019 and below the reset trip device
022 are the reset lockout movable contact 031 and a mating reset
lockout static contact 032. A spring supporter 009 is located below
the reset button 10, two trip assistant springs 028-1,028-2 are
placed below the two ends of the spring supporter 009 respectively,
and two trip assistant springs 028-1,028-2 are pressed on the
movable contacts 012-1,012-2 of the reset trip device 022
respectively. On the two sides of the spring supporter 009 are a
20A receptacle conducting piece 026-1 and a 15A receptacle
conducting piece 026-2 respectively.
[0034] As seen in FIG. 2-2, it shows the structure of the reverse
trip protection device. The said reverse trip protection device
includes a reset core rod 025 which is under the reset button 010
and has a sharp head on the lower end. A reset spring 027 fits to
the upper end of the reset core rod 025. At the sharp end of the
reset core rod 025, there is a reset trip latch 030. Two reverse
trip conducting springs 033-1,033-2 are located beside the two
sides of the trip coil racket 019. One end each of the two reverse
trip conducting springs 033-1,033-2 is fixed to the circuit board
013, above the other end is the reset trip device 022. Under the
reset button 010, there is one compression spring bracket 009.
Under the two sides of the bracket 009, there are two trip
assisting spring 028-1, 028-2 which are located respectively on the
two movable contacts 021-1, 021-2 of the line side above the reset
trip device 022.
[0035] Referring to FIG. 3, it is the reset button of the structure
of FIG. 2-1, illustrating the location and connection of various
reverse conducting components on the back of the circuit board 013.
Among them, the reset lockout movable contact 031 and the reset
lockout static contact 032 is connected to the trip coil 020
respectively.
[0036] Referring to FIG. 4, it shows, in the structure of FIG. 2-1,
the reset button 010 with lockout device in the tripped position.
When the reset button 010 is in the tripped position, the lower end
of the reset core rod 025 is separated from the reset lockout latch
030. It also shows the circuit interrupter of the present invention
that includes the grounding supporter 034, grounding screw 035,
grounding accessory 037, and a test piece 24 which is placed below
the test button 008.
[0037] Referring to FIG. 5, it shows, in the structure of FIG. 2-
1, the condition of the reset button 010 which cannot be reset
while the GFCI is in reverse connection. When the reset button is
depressed and the reset core is already depressed, the reset
lockout movable contact 031 is in contact with the reset lockout
static contact 040 already, so the reset button 010 is propped up
by the reset latch 030, the device can't be reset to deliver
power.
[0038] Referring to FIG. 6, it is the transverse section view of
FIG. 5, the reset lockout movable contact 031 is in contact with
the reset lockout static contact 032 already, no current flows
through the trip coil 020, the trip coil has no action, the reset
button 010 remains in the tripped condition.
[0039] FIG. 7 is the structural diagram of the reset button in FIG.
2-1 while the line side of the circuit interrupter is connected to
the power source and fed with power. When the reset button 010 is
depressed, it will bring the reset trip device 022 downward, which
causes the reset lockout movable contact 031 making contact with
static contact 032, so current flows into the trip coil 020, and it
utilizes the actuating components of the circuit board to active
the coil member. This motivates the trip core 021 to activate the
latch 030, which will bring the trip device 022 rise synchronously,
this in turn will move the conducting movable contacts 012-1,012-2
upward and rise along with the trip device 022, until they touch
the socket conducting static contacts and the static contacts of
the load side at the same time. Thus the electrical continuity is
reestablished. At this time, reset lockout movable contact 031 is
in a condition separated from the reset lockout static contact 032
and will never affect the normal operation of the circuit
interrupter.
[0040] FIG. 8 is the structure of FIG. 2-1. It concerns the reset
button 010 of the circuit interrupter with the lockout mechanism,
and shows in detail the condition the conducting movable contacts
012-1,012-2 is in touching with the static contacts 015-1, 015-2,
and the location of components in the device. One end of the trip
core 021 below the reset button 010 is inserted into the center of
the trip coil bracket 019 and magnetic piece 038, the other end
supporting the trip latch 030. A reset spring 027 fits with the
reset core rod 025. And two trip assistant springs 028-1,028-2 are
pressed on the conducting movable contacts 012-1,012-2
respectively.
[0041] Referring to FIG. 9, which shows the structure of FIG. 2-1,
the reset button 010 of the circuit breaker has a lockout mechanism
and FIG. 9 mainly illustrates the position of this components. In
the center of the trip device 022 facing the reset button 010,
there is a reset lockout latch 030, which comprises the reset
lockout spring 036 inside. The reset spring 036 and the trip core
021 are separated from each other by a reset trip lockout latch
030. A reset lockout movable contact 031 and its mating reset
tripping lockout static contact 032 are placed on the bottom end of
the reset trip device 022. Over the trip coil 020 on the trip coil
bracket 019 is wrapped a U-shaped magnet 038 which is fixed between
the two ends of the trip coil bracket 019. A magnetic cover 040 is
placed between the trip core 021 inside the trip coil bracket 019
and the reset trip lockout latch 030. The magnetic cover 040 and
the U-shaped magnet 038 are connected together. Between the trip
core 021 and the magnetic cover 040 there is placed the trip core
spring 039. As mention above, in the trip device of this invention
there are a U-shaped magnet 038 which is connected with the
magnetic cover 040 and the trip core spring 039 placed on one end
of the trip coil 020. It is due to these improvements, the number
of coil turns of the trip coil 020 is decreased, its volume is
decreased but its magnetic force is increased at the same time.
[0042] FIG. 10 of the structure of FIG. 2-1 is a more detailed view
of the lockout mechanism and the conducting pieces of the load
side, showing the structure of the reset lockout mechanism that
prevents erroneous reverse wiring more clearly. The conducting
pieces 007-1,007-2 are connected to the movable contacts
012-1,012-2 of the line side by the line side conductors
011-1,011-2. It shows the shape and relative position of the socket
conducting piece 026-2 and reset lockout movable contact 031, reset
lockout static contact 032 and reset trip device 022. The trip coil
020 of the trip core 021 and the reset lockout spring 036 are
placed on the trip coil 019 in turn. The two load side conducting
static contacts 015-1,015-2 with the silver points 014 are fixed to
the two wiring pieces 018-1,018-2 respectively.
[0043] FIG. 11, of the structure of FIG. 2-1, is a cutaway view of
the reverse wiring protection device in the tripped position. Here
the reset button 010 is in the tripped position, while the reverse
trip conducting spring 033-1 is depressed by the reset trip device
022, and is separated from the reverse trip contact 016-1.
[0044] FIG. 12, of the structure of FIG. 2-2, is a reverse trip
protection device of the reset button 010 in the closed position.
When the reset button 010 is depressed, the reset core rod 025 of
the reset button 010 is locked by the reset lockout latch 030. The
reset trip device 022 moves upward because of the force of the
reset spring 027 and causes the reverse conducting spring 033-1
making touch with the reverse trip guarding contact 016-1, so the
reverse trip guarding device is in the switch-on position, and the
conducting electrical contact 012-1 doesn't touch the conducting
piece contact 026-1, so no current flows in the receptacle.
[0045] FIG. 13, of the structure of FIG. 2-1, shows the reverse
trip protection device of the reset button 010 in the closed
position (see FIG. 12). The trip coil 020 is activated by the
energized circuit interrupter and it activates like lightning. The
trip core 021 begins to press the reset latch spring 036 because of
the magnetic force, and opens the reset trip latch 030, thus making
the reset 010 separate from the reset lockout latch 030. The trip
assistant spring 028-1 springs back immediately, and its force
pushes the reset trip device 022 to return to the original
position, which in turn brings down the reverse trip conducting
springs 033-1,033-2 causing them separate from the reverse
protection contacts 016-1,016-2, thus the reverse wiring protection
device is put into the open condition.
[0046] FIG. 14 is the structure of FIG. 2-2. The electrical
continuity between the line side and the load side is established
and the reset button 010 is in reset position. When the power
source is introduced into the circuit through the line side,
pressing down the reset button to activate the reset trip lockout
latch 030, the reset core rod 025 of the reset button 010 is locked
by the reset trip lockout 030. At this moment, reset spring 027
begins moving upward, which help the reset trip device 022 moves
upward too. Meanwhile, following the reset trip device 022, the
line side conducting movable contacts 012-1, 012-2 move upward, and
connect with two receptacle conducting contacts 026-1, 026-2 and
load side conducting static contacts 015-1, 015-2, so that the load
side power of the interrupter gets through. At this time, the
reverse wiring device is in the open position, and it will never
affect the normal operation of the interrupter.
[0047] FIG. 15 shows the basic structure of FIG. 2-2 and further
illustrates the reverse trip protection device of reset button 010
and the connection of the line side and the load side. As shown in
FIG. 15, two conducting pieces 007-1,007-2 of the line side are
connected respectively to the two conducting movable contacts
012-1,012-2 with the two conductors 011-1,011-2 of the line side.
Two conducting static contacts 015-1,015-2 of the load side are
fixed respectively to the wiring pieces 018-1,018-2 of the load
side. The silver points 014 of the two load side conducting static
contacts is in touch with the silver points 014 of the line side
conducting movable contacts. The load side is connected to the
reverse conducting springs 033-1,033-2 below the reverse trip
device 022 through the reverse trip conductors. One end of the trip
core 021 is fixed to the center of the trip coil bracket, the other
end supports the reset trip latch 030. The upper ends of the two
reverse trip protection contacts 016-1,016-2 pass respectively
through the two ends of the reset trip device 022, and the lower
ends are fixed to the circuit board 013.
[0048] FIG. 16 is a bottom view with the circuit board 013 removed.
It shows mainly the structure and the position of the components in
the reverse trip protection device and the structure of the load
side conducting pieces. At the central part of the reset trip
device 022 facing the reset button 010, is placed a reset trip
lockout 030, which includes the reset lockout spring 036. There is
a reset trip lockout 030 between the reset lockout 036 and trip
core 021. Two reverse trip protection movable contacts 016-1, 016-2
by passing through the reset trip device 022 are set on the reverse
trip conducting spring 033-1, 033-2 respectively.
* * * * *